A source at NBC tells the New York Post's Page Six that Ed Klein, who is at work on an unauthorized bio of Katie Couric, has found plenty of Peacockers to talk (albeit off the record) about the perky morning-gal-turned-evening-news-anchor - "And it isn't nice," says the snitch. "They are drudging up stuff that will be a nightmare for her. She wasn't very nice for a long time when she was here." Case in point: My own horribly placed insider tells me Katie would never share her Mystic Tan.